Very poor after sales service!!

I have had the most frustrating experience. We purchased a car at the start of May 2021. The car was advertised as having a radio with Bluetooth as well as GPS. This was one of the reasons we bought it,it is for our parents,who are old. My dad has cancer and has to go treatments at various hospitals and doctors. The GPS is important for my mom as well as the Bluetooth system. The entire radio/GPS system does not work. I contacted their complaints department and almost 2 months later,this has still not been sorted out. A few weeks ago,they called me and said they will pay for a replacement system only to call me a few minutes later to tell me I have to take it to be checked out. Now,they want us to travel to a workshop more than 100km from my parents. These are elderly people,my father can no longer work and is in a wheelchair.